Bonus Mixes really means that in addition to the songs on the CD, the purchaser gets a bonus - mixes (versions) of songs that are different than the main tracks on the album.
In Poodle Hat's case, there are 8 such additional mixes, and I will spill a bean or two and say that they're mixes of the original songs from the album.
But wait, aren't there only 6 originals on the album?
heh heh heh...
*Crosses fingers for a Remix of TRIGGER HAPPY*
Dang Bermuda.. you really have a way of twisting our noggins around..